The rainbow may be the cloak of the Rainbow Guard of court of Renly, given to the best f-ing character in the series, Brienne of Tarth, when she won command in tourney. She keeps it still! If you had to choose an object in GOT to rival the iron throne, this might be it (to a book fan, anyway, it doesn’t appear in HBO), though it’s a very sad and tragic object.

The colors above match the Rainbow Cloak. For the purpose of meeting Mrs. Chicks hopes, I think the internet can grant this wish. :-)